Campus lan and Wireless lan solution Design Guide

Note: 
SMUs are only released on long-lived Cisco IOS-XE extended maintenance releases. 
AP patches using Access Point Service Packs (APSPs) 
Cisco Catalyst 9800 Series wireless controllers support rolling out critical AP bug fixes using APSPs. APSP 
rollout can be based upon sites, with the fix predownloaded and rolled out to only affected AP models.
With rolling AP upgrade, AP upgrades can be staggered to ensure RF coverage to clients throughout the 
upgrade process. Rolling updates support automatic candidate selection using Radio Resource Management 
(RRM)-based AP neighbor information. Based upon a chosen percentage per iteration (5%, 15% or 25%, with 
the default being 15%) the wireless controller auto-selects candidate APs to be upgraded in each iteration. 
Clients from the candidate APs are actively steered away using 802.11v packets with the "disassociation 
imminent" field set, to help ensure seamless network connectivity as the APs are upgraded. Clients that do not 
honor this setting are de-authenticated before the AP is reloaded.

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Support for new AP models using Access Point Device Packs (APDPs) 
Beginning with Cisco IOS-XE release 16.11, Cisco Catalyst 9800 Series wireless controllers provide a way to 
support new AP models using APDPs. This provides a way to introduce new AP models into your network 
without having to upgrade the wireless controller software version. Also, since the APDPs are hot patches, they 
do not require a reload and require no downtime of the wireless controller.
The following table summarizes high availability support with the various controllers. 
Table 4.
 
High availability feature support 
Platform 
HA SSO